Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161023AbbFEGn7 (ORCPT ); Fri, 5 Jun 2015 02:43:59 -0400 Received: from e23smtp08.au.ibm.com ([202.81.31.141]:57571 "EHLO e23smtp08.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932341AbbFEGhI (ORCPT ); Fri, 5 Jun 2015 02:37:08 -0400 From: Alexey Kardashevskiy To: linuxppc-dev@lists.ozlabs.org Cc: Alexey Kardashevskiy , Alex Williamson , Benjamin Herrenschmidt , David Gibson , Gavin Shan , Paul Mackerras , Wei Yang , linux-kernel@vger.kernel.org Subject: [PATCH kernel v12 06/34] vfio: powerpc/spapr: Move page pinning from arch code to VFIO IOMMU driver Date: Fri, 5 Jun 2015 16:34:58 +1000 Message-Id: <1433486126-23551-7-git-send-email-aik@ozlabs.ru> X-Mailer: git-send-email 2.4.0.rc3.8.gfb3e7d5 In-Reply-To: <1433486126-23551-1-git-send-email-aik@ozlabs.ru> References: <1433486126-23551-1-git-send-email-aik@ozlabs.ru> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15060506-0029-0000-0000-000001A9A606 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8155 Lines: 262 This moves page pinning (get_user_pages_fast()/put_page()) code out of the platform IOMMU code and puts it to VFIO IOMMU driver where it belongs to as the platform code does not deal with page pinning. This makes iommu_take_ownership()/iommu_release_ownership() deal with the IOMMU table bitmap only. This removes page unpinning from iommu_take_ownership() as the actual TCE table might contain garbage and doing put_page() on it is undefined behaviour. Besides the last part, the rest of the patch is mechanical. Signed-off-by: Alexey Kardashevskiy [aw: for the vfio related changes] Acked-by: Alex Williamson Reviewed-by: David Gibson Reviewed-by: Gavin Shan --- Changes: v9: * added missing tce_iommu_clear call after iommu_release_ownership() * brought @offset (a local variable) back to make patch even more mechanical v4: * s/iommu_tce_build(tbl, entry + 1/iommu_tce_build(tbl, entry + i/ --- arch/powerpc/include/asm/iommu.h | 4 -- arch/powerpc/kernel/iommu.c | 55 ------------------------- drivers/vfio/vfio_iommu_spapr_tce.c | 80 +++++++++++++++++++++++++++++++------ 3 files changed, 67 insertions(+), 72 deletions(-) diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h index 8353c86..e94a5e3 100644 --- a/arch/powerpc/include/asm/iommu.h +++ b/arch/powerpc/include/asm/iommu.h @@ -194,10 +194,6 @@ extern int iommu_tce_build(struct iommu_table *tbl, unsigned long entry, unsigned long hwaddr, enum dma_data_direction direction); extern unsigned long iommu_clear_tce(struct iommu_table *tbl, unsigned long entry); -extern int iommu_clear_tces_and_put_pages(struct iommu_table *tbl, - unsigned long entry, unsigned long pages); -extern int iommu_put_tce_user_mode(struct iommu_table *tbl, - unsigned long entry, unsigned long tce); extern void iommu_flush_tce(struct iommu_table *tbl); extern int iommu_take_ownership(struct iommu_table *tbl); diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c index 73eb39a..0019c80 100644 --- a/arch/powerpc/kernel/iommu.c +++ b/arch/powerpc/kernel/iommu.c @@ -986,30 +986,6 @@ unsigned long iommu_clear_tce(struct iommu_table *tbl, unsigned long entry) } EXPORT_SYMBOL_GPL(iommu_clear_tce); -int iommu_clear_tces_and_put_pages(struct iommu_table *tbl, - unsigned long entry, unsigned long pages) -{ - unsigned long oldtce; - struct page *page; - - for ( ; pages; --pages, ++entry) { - oldtce = iommu_clear_tce(tbl, entry); - if (!oldtce) - continue; - - page = pfn_to_page(oldtce >> PAGE_SHIFT); - WARN_ON(!page); - if (page) { - if (oldtce & TCE_PCI_WRITE) - SetPageDirty(page); - put_page(page); - } - } - - return 0; -} -EXPORT_SYMBOL_GPL(iommu_clear_tces_and_put_pages); - /* * hwaddr is a kernel virtual address here (0xc... bazillion), * tce_build converts it to a physical address. @@ -1039,35 +1015,6 @@ int iommu_tce_build(struct iommu_table *tbl, unsigned long entry, } EXPORT_SYMBOL_GPL(iommu_tce_build); -int iommu_put_tce_user_mode(struct iommu_table *tbl, unsigned long entry, - unsigned long tce) -{ - int ret; - struct page *page = NULL; - unsigned long hwaddr, offset = tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK; - enum dma_data_direction direction = iommu_tce_direction(tce); - - ret = get_user_pages_fast(tce & PAGE_MASK, 1, - direction != DMA_TO_DEVICE, &page); - if (unlikely(ret != 1)) { - /* pr_err("iommu_tce: get_user_pages_fast failed tce=%lx ioba=%lx ret=%d\n", - tce, entry << tbl->it_page_shift, ret); */ - return -EFAULT; - } - hwaddr = (unsigned long) page_address(page) + offset; - - ret = iommu_tce_build(tbl, entry, hwaddr, direction); - if (ret) - put_page(page); - - if (ret < 0) - pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%d\n", - __func__, entry << tbl->it_page_shift, tce, ret); - - return ret; -} -EXPORT_SYMBOL_GPL(iommu_put_tce_user_mode); - int iommu_take_ownership(struct iommu_table *tbl) { unsigned long sz = (tbl->it_size + 7) >> 3; @@ -1081,7 +1028,6 @@ int iommu_take_ownership(struct iommu_table *tbl) } memset(tbl->it_map, 0xff, sz); - iommu_clear_tces_and_put_pages(tbl, tbl->it_offset, tbl->it_size); /* * Disable iommu bypass, otherwise the user can DMA to all of @@ -1099,7 +1045,6 @@ void iommu_release_ownership(struct iommu_table *tbl) { unsigned long sz = (tbl->it_size + 7) >> 3; - iommu_clear_tces_and_put_pages(tbl, tbl->it_offset, tbl->it_size); memset(tbl->it_map, 0, sz); /* Restore bit#0 set by iommu_init_table() */ diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c index 730b4ef..b95fa2b 100644 --- a/drivers/vfio/vfio_iommu_spapr_tce.c +++ b/drivers/vfio/vfio_iommu_spapr_tce.c @@ -147,6 +147,67 @@ static void tce_iommu_release(void *iommu_data) kfree(container); } +static int tce_iommu_clear(struct tce_container *container, + struct iommu_table *tbl, + unsigned long entry, unsigned long pages) +{ + unsigned long oldtce; + struct page *page; + + for ( ; pages; --pages, ++entry) { + oldtce = iommu_clear_tce(tbl, entry); + if (!oldtce) + continue; + + page = pfn_to_page(oldtce >> PAGE_SHIFT); + WARN_ON(!page); + if (page) { + if (oldtce & TCE_PCI_WRITE) + SetPageDirty(page); + put_page(page); + } + } + + return 0; +} + +static long tce_iommu_build(struct tce_container *container, + struct iommu_table *tbl, + unsigned long entry, unsigned long tce, unsigned long pages) +{ + long i, ret = 0; + struct page *page = NULL; + unsigned long hva; + enum dma_data_direction direction = iommu_tce_direction(tce); + + for (i = 0; i < pages; ++i) { + unsigned long offset = tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK; + + ret = get_user_pages_fast(tce & PAGE_MASK, 1, + direction != DMA_TO_DEVICE, &page); + if (unlikely(ret != 1)) { + ret = -EFAULT; + break; + } + hva = (unsigned long) page_address(page) + offset; + + ret = iommu_tce_build(tbl, entry + i, hva, direction); + if (ret) { + put_page(page); + pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n", + __func__, entry << tbl->it_page_shift, + tce, ret); + break; + } + tce += IOMMU_PAGE_SIZE_4K; + } + + if (ret) + tce_iommu_clear(container, tbl, entry, i); + + return ret; +} + static long tce_iommu_ioctl(void *iommu_data, unsigned int cmd, unsigned long arg) { @@ -195,7 +256,7 @@ static long tce_iommu_ioctl(void *iommu_data, case VFIO_IOMMU_MAP_DMA: { struct vfio_iommu_type1_dma_map param; struct iommu_table *tbl = container->tbl; - unsigned long tce, i; + unsigned long tce; if (!tbl) return -ENXIO; @@ -229,17 +290,9 @@ static long tce_iommu_ioctl(void *iommu_data, if (ret) return ret; - for (i = 0; i < (param.size >> IOMMU_PAGE_SHIFT_4K); ++i) { - ret = iommu_put_tce_user_mode(tbl, - (param.iova >> IOMMU_PAGE_SHIFT_4K) + i, - tce); - if (ret) - break; - tce += IOMMU_PAGE_SIZE_4K; - } - if (ret) - iommu_clear_tces_and_put_pages(tbl, - param.iova >> IOMMU_PAGE_SHIFT_4K, i); + ret = tce_iommu_build(container, tbl, + param.iova >> IOMMU_PAGE_SHIFT_4K, + tce, param.size >> IOMMU_PAGE_SHIFT_4K); iommu_flush_tce(tbl); @@ -273,7 +326,7 @@ static long tce_iommu_ioctl(void *iommu_data, if (ret) return ret; - ret = iommu_clear_tces_and_put_pages(tbl, + ret = tce_iommu_clear(container, tbl, param.iova >> IOMMU_PAGE_SHIFT_4K, param.size >> IOMMU_PAGE_SHIFT_4K); iommu_flush_tce(tbl); @@ -357,6 +410,7 @@ static void tce_iommu_detach_group(void *iommu_data, /* pr_debug("tce_vfio: detaching group #%u from iommu %p\n", iommu_group_id(iommu_group), iommu_group); */ container->tbl = NULL; + tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); iommu_release_ownership(tbl); } mutex_unlock(&container->lock); -- 2.4.0.rc3.8.gfb3e7d5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/